-64.87% is the change from 817 to 287
Calculation steps:
[( 287 - 817 ) ÷ 817] x 100 = -64.87%
Formula
Percentage change = [(287 - 817) / 817] x 100
Subtract the new number by the original number
287 - 817 = -530
-530 ÷ 817 = -0.6487148102815178
-0.6487148102815178 x 100 = -64.87%